Turner Syndrome: Causes, Symptoms and Treatment
Turner syndrome is a genetic condition in females caused by a missing or incomplete X chromosome. It can lead to short stature, heart defects, and infertility.
Things worth knowing about "Turner syndrome"
Turner syndrome is a genetic condition in females caused by a missing or incomplete X chromosome. It can lead to short stature, heart defects, and infertility.
What is Turner Syndrome?
Turner syndrome (also known as Ullrich-Turner syndrome) is a chromosomal condition that affects only females. It occurs when one of the two X chromosomes is partially or completely missing. In typical female development, two X chromosomes are present (karyotype 46,XX). In Turner syndrome, the most common pattern involves only one X chromosome (karyotype 45,X). The condition was first described by endocrinologist Henry Turner in 1938.
Causes
Turner syndrome results from an error in cell division during the formation of the egg or sperm cell, or less commonly, shortly after fertilization. The main chromosomal patterns include:
- Monosomy X (45,X): The most common form; one X chromosome is entirely absent.
- Mosaic Turner syndrome: Some cells have the normal chromosomal complement, others do not. Symptoms may be milder.
- Structural abnormalities: One X chromosome is present but has structural changes such as deletions, ring formations, or isochromosome formation.
Turner syndrome is not inherited and occurs across all ethnic backgrounds. It is estimated to affect approximately 1 in 2,000 to 2,500 live female births.
Symptoms
The clinical features of Turner syndrome vary widely. Common signs and symptoms include:
- Short stature: Without treatment, the average adult height is approximately 143 to 146 cm (about 4 feet 8 inches).
- Ovarian insufficiency: The ovaries often do not develop properly (streak gonads or gonadal dysgenesis), leading to absent puberty and infertility in most cases.
- Webbed neck: Excess skin on the neck (pterygium colli) is a characteristic physical feature.
- Lymphedema: Swelling of the hands and feet, especially noticeable in newborns.
- Heart defects: Congenital heart anomalies, such as coarctation of the aorta or bicuspid aortic valve, occur in up to 50% of affected individuals.
- Kidney abnormalities: Structural kidney malformations are found in approximately one-third of those affected.
- Low hairline: A low-set hairline at the back of the neck.
- Broad chest: A shield-shaped chest with widely spaced nipples.
- Learning differences: Individuals often have strong verbal skills but may experience difficulties with spatial reasoning and mathematics.
Diagnosis
Turner syndrome can be diagnosed at various stages of life:
Prenatal Diagnosis
During pregnancy, Turner syndrome can be identified through chromosomal analysis (karyotyping) using amniocentesis or chorionic villus sampling (CVS). Non-invasive prenatal testing (NIPT) may also raise suspicion.
Diagnosis in Childhood and Adolescence
Turner syndrome is often identified due to short stature or absent puberty. Confirmation is made through a blood karyotype test.
Further Investigations
- Echocardiography to assess for cardiac defects
- Renal ultrasound
- Hormone levels (LH, FSH, estrogen)
- Bone age assessment via X-ray
Treatment
While Turner syndrome cannot be cured, many of its features and complications can be effectively managed:
Growth Hormone Therapy
Early treatment with growth hormone (somatropin) can significantly improve final adult height and is typically started in early school age.
Estrogen Replacement Therapy
Since the ovaries usually produce insufficient estrogen, estrogen replacement therapy is prescribed to initiate puberty, protect bone health, and reduce cardiovascular risk. A combined estrogen-progestogen regimen is often used in adulthood.
Fertility Options
Natural pregnancy is uncommon due to ovarian failure. However, egg donation combined with in vitro fertilization (IVF) offers a pathway to pregnancy for some women. Specialized reproductive counseling is recommended.
Cardiac Monitoring
Lifelong cardiology follow-up is essential, as heart defects and aortic dissection represent ongoing risks throughout life.
Psychological Support
Psychological counseling and peer support groups can help individuals and families cope with the diagnosis and build confidence and well-being.
Prognosis
With early diagnosis and comprehensive medical care, women with Turner syndrome can lead full and fulfilling lives. Life expectancy is close to normal when associated conditions such as heart disease are appropriately managed. Regular health monitoring is required throughout life.
References
- Gravholt, C. H. et al. - Clinical practice guidelines for the care of girls and women with Turner syndrome. European Journal of Endocrinology, 177(3), G1-G70 (2017).
- Stochholm, K. et al. - Prevalence, incidence, diagnostic delay, and mortality in Turner syndrome. Journal of Clinical Endocrinology & Metabolism, 91(10), 3897-3902 (2006).
- National Institutes of Health (NIH), National Human Genome Research Institute - Turner Syndrome Fact Sheet, available at www.genome.gov.
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